There three main natural sources of hydrocarbons: natural gas, petroleum and coal.
Natural sources for americium doesn't exist.
Anthrax (the disease caused by the bacterium bacillus anthracis) was indeed man-made. The bacteria was genetically engineered to be much more lethal than the previous natural form of the bacterium.
they are both natural sources of energy
natural energy sources
The difference between natural and artificial sources of light is that natural sources are produced by the sun while artificial light sources illuminate using energy from other sources and include incandescent bulbs.
Natural sources of green house effect includes volcanic eruptions,
one natural resource is the sun
what is the history on the anthrax disease
The Anthrax was created in 1982.
bacillus anthrax
A person with anthrax isn't considered contagious so if you get anthrax then no you are not contagious.